please help on this one?

An atomic bomb is a device that has been used as a nuclear weapon by means of nuclear fission (separation of a heavy nucleus into lighter nuclei). It should be noted that there are also devices that work with nuclear fusion (the union of two nuclei) but until now there are no records of their use for war purposes.

This type of fission bombs release a large amount of energy (in the form of heat and radiation of all wavelengths, including dangerous ionizing radiation) by provocating a sustained chain reaction, after which convective processes (transmission of heat through the air) are produced, causing its characteristic mushroom shape with the expansive wave and destroying everything in its path.

Answer:

The answer would be an Atomic Bomb.

an atomic bomb is  a nuclear weapon in which enormous energy is released by nuclear fission.

Explanation:

The magnitude of the block's acceleration at the top of a frictionless circular loop consists of the centripetal acceleration required to maintain its circular path and the acceleration due to gravity. At the top of the loop, the total acceleration is thus equal to the acceleration due to gravity, approximately 9.8 m/s² downwards.

You are asking about the magnitude of the block's acceleration at the top of a frictionless circular loop. In physics, acceleration of an object moving in a circle can be described by the centripetal acceleration formula a = v^2/r, where v is the velocity of the object and r is the radius of the circle. At the top of the loop, besides the centripetal acceleration, the block is also experiencing acceleration due to gravity, acting downwards. So, the total acceleration is a combination of the centripetal acceleration needed to stay in a circular path, and the acceleration due to gravity.

To understand this concept, we can use Newton's second law in the context of circular motion. When the small block is at the top of the loop, the only force acting towards the center of the circle, which provides the centripetal force, is the weight of the block (mg, where 'm' is the mass of the block and 'g' is the acceleration due to gravity). Therefore, at the top of the loop, the centripetal force equals the gravitational force (Fc = mg), and thus the centripetal acceleration is equal to the acceleration due to gravity (ac = g). This results in the block's total acceleration at the top of the loop being g, or approximately 9.8 m/s² downwards.

Answer:

Speed

Explanation:

Speed is a scalar quantity, defined as the ratio between the distance covered and the time taken:

[tex]v=\frac{d}{t}[/tex]

where

d is the distance covered

t is the time taken

Speed is measured in meters/second (m/s).

It should be noted that speed is different from velocity: in fact, velocity is a vector quantity, whose magnitude is defined as

[tex]v=\frac{d}{t}[/tex]

where d is the displacement (not the distance), and it also has a direction, while speed does not have it.

Answer:

Speed

Explanation:

did it on edge 2020

That would be Earth, because astronomical unit is defined as distance between Earth and sun.

Hope this helps.

r3t40

Answer:

the speed of particles decreases as the states of matter change. to support: in a solid, the speed of particles is slow. in a liquid, the speed of particles is mediocre. and in a gas, the speed of particles is fast since they are spread out.

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Explanation:

Answer:

C) 3.0 joules

Explanation:

The kinetic energy of the ball is given by:

[tex]K=\frac{1}{2}mv^2[/tex]

where

m = 0.059 kg is the mass of the ball

v is its speed

At the beginning, v = 26 m/s, so the initial kinetic energy is

[tex]K=\frac{1}{2}(0.059 kg)(26 m/s)^2=20 J[/tex]

after the rebound, v = 24 m/s, so the final kinetic energy is

[tex]K=\frac{1}{2}(0.059 kg)(24 m/s)^2=17 J[/tex]

So, the energy that was lost is

[tex]E=20 J-17 J=3 J[/tex]

Newton's 3rd law: The force that A exerts on B is equal and opposite (in direction) to the force that B exerts on A.

Substitute the words "the earth" for A and "the book" for B.

A book rests on a table. The earth pulls down on the book through the weight force then the force is the reaction force to the weight force would be the force of the table on the book. Therefore the correct answer is option 2.

Newton's third law of motion explains that forces exist in pairs. It states that for every action force there exist equal and opposite reaction forces, these pairs of forces are equal in magnitude but opposite in direction.

Reactive force is a kind of force that acts in the opposite direction from the force that is applied. For instance, when active force is applied to a stationary wall, the wall will exert reactive force in the opposite direction.

Active and reactive forces always act in pairs and are equal in their magnitude but opposite in direction.

As per the given problem, on a table, there is a book. The weight of the earth pulls down on the book, and then the force of the table on the book acts as a reaction to the weight force. Therefore the correct answer is option 2.

Learn more about Newton's third law of motion from here

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22.4 L is the answer

hope this help

Answer:

Because they are small and they shrink when they have microwaves hit towards them

Explanation:

The angle is preferred to be small in high resolution optical instruments to make it more noticeable.

Explanation:

The capability of any device that form image can be an optical or radio telescope, camera, microscope or eye that can distinguish small details in the object is called angular resolution.  

This is the main component for image resolution. The accuracy in the measurement with accordance of space is spatial resolution. It is associated with the angular resolution.  

The ability of viewing an object in a distinct manner requires smaller angular distance and this is known as resolving power. When we need to view an object in an accurate and in a distinct manner, it is required to be in  smaller angle between the viewing objects.

Your answers are correct. You have to read the plaques in the virtual lab to find the answers. So it shows you read them.

1. billion

2. modern

3. Organism

4. Heights

5. clams

6. flowery

Answer:

No

Explanation:

Let's assume the gas pressure is constant. Then we can use Charle's law, which states that the volume of the gas is proportional to the absolute temperature (in Kelvin):

[tex]\frac{V}{T}=const.[/tex]

This can be rewritten as

[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]

where we have

[tex]T_1 = 100^{\circ}+273 =373 K[/tex]  is the initial temperature of the gas

[tex]T_2 = 50^{\circ}+273 =323 K[/tex]  is the final temperature of the gas

Re-arranging the previous equation, we find

[tex]V_2=V_1 \frac{T_2}{T_1}=V_1 \frac{323 K}{373 K}=0.87 V_1[/tex]

so, the volume of the gas decreases by a factor 0.87.

Answer: [tex]2.13(10)^{-19} J[/tex]

Explanation:

The photoelectric effect consists of the emission of electrons (electric current) that occurs when light falls on a metal surface under certain conditions.  

If the light is a stream of photons and each of them has energy, this energy is able to pull an electron out of the crystalline lattice of the metal and communicate, in addition, a kinetic energy.  

This is what Einstein proposed:  

Light behaves like a stream of particles called photons with an energy  [tex]E[/tex]

[tex]E=h.f[/tex] (1)

Where:

[tex]h=6.63(10)^{-34}J.s[/tex] is the Planck constant  

[tex]f[/tex] is the frequency

Now, the frequency has an inverse relation with the wavelength [tex]\lambda[/tex]:  

[tex]f=\frac{c}{\lambda}[/tex] (2)  

Where [tex]c=3(10)^{8}m/s[/tex] is the speed of light in vacuum  and [tex]\lambda=400nm=400(10)^{-9}m[/tex] is the wavelength of the absorbed photons in the photoelectric effect.

Substituting (2) in (1):

[tex]E=\frac{h.c}{\lambda}[/tex] (3)

So, the energy [tex]E[/tex] of the incident photon must be equal to the sum of the Work function [tex]\Phi[/tex] of the metal and the maximum kinetic energy [tex]K_{max}[/tex] of the photoelectron:  

[tex]E=\Phi+K_{max}[/tex] (4)  

Rewriting to find [tex]K_{max}[/tex]:

[tex]K_{max}=E-\Phi[/tex] (5)

Where [tex]\Phi[/tex] is the minimum amount of energy required to induce the photoemission of electrons from the surface of a metal, and its value depends on the metal:

[tex]\Phi=h.f_{o}=\frac{h.c}{\lambda_{o}}[/tex] (6)

Being [tex]\lambda_{o}=700nm=700(10)^{-9}m[/tex] the threshold wavelength (the minimum wavelength needed to initiate the photoelectric effect)

Substituting (3) and (6) in (5):  

[tex]K_{max}=\frac{h.c}{\lambda}-\frac{h.c}{\lambda_{o}}[/tex]

[tex]K_{max}=h.c(\frac{1}{\lambda}-\frac{1}{\lambda_{o}})[/tex] (7)

Substituting the known values:

[tex]K_{max}=(6.63(10)^{-34}J.s)(3(10)^{8}m/s)(\frac{1}{400(10)^{-9}m}-\frac{1}{700(10)^{-9}m})[/tex]

[tex]K_{max}=2.13(10)^{-19} J[/tex] >>>>>This is the maximum kinetic energy that ejected electrons must have when violet light illuminates the material

Answer:

Divergent plate margins

Explanation:

Divergent plate margins are constructive zones on the surface of the earth. They are constructive in the sense that new materials are brought to the surface from within the crust.

An example of such is the mid-altlantic ridge. Here as two plates pull apart, new melts up-wells and finds a way to get to the surface where they cool and solidify.

I think this is TRUE. Ph is calculating the acidic acids in water. And you need to know the concentration of hydronium ions. Hope this helped !

Answer:

1020 m/s

Explanation:

The moon is in the earth's orbit, meaning it is in free fall.  Its centripetal acceleration is equal to the acceleration due to gravity.

v² / r = GM / r²

v² = GM / r

v = √(GM / r)

G is the universal gravitational constant, M is the mass of the earth, and r is the distance from the earth's center to the moon's center.

G = 6.67×10⁻¹¹ m³/kg/s²

M = 5.97×10²⁴ kg

r = 3.84×10⁸ m

v = √( (6.67×10⁻¹¹) (5.97×10²⁴) / (3.84×10⁸) )

v = 1020 m/s

Answer: Valence electrons

Valence electrons are those that are in the outermost or superficial layer of the atom, which means they have the highest energy compared to those of the inner layers.

Because of their position, it is easier for these electrons to interact with other atoms of their own element as well as different elements. This is done through the process of forming bonds when being attracted by other atoms.

Answer:

[tex]2.41\cdot 10^{13}Hz, 1.24\cdot 10^{-5}m[/tex]

Explanation:

The energy of the photon must be equal to 0.1 eV, so let's convert this value into Joules first:

[tex]E=0.1 eV \cdot 1.6\cdot 10^{-19} J=1.6\cdot 10^{-20}J[/tex]

The energy of the photon is related to its frequency by

[tex]E=hf[/tex]

where h is the Planck constant and f is the frequency. Substituting,

[tex]f=\frac{E}{h}=\frac{1.6\cdot 10^{-20}J}{6.63\cdot 10^{-34}Js}=2.41\cdot 10^{13}Hz[/tex]

And now we can find the wavelength of the photon, which is given by

[tex]\lambda=\frac{c}{f}[/tex]

where c is the speed of light. Substituting,

[tex]\lambda=\frac{3\cdot 10^8 m/s}{2.41\cdot 10^{13} Hz}=1.24\cdot 10^{-5}m[/tex]

There are "local tsunamis", which are formed near the epicenter of the earthquake and it takes only a few minutes to reach the coast and there are tsunamis whose epicenter is distant (due to an earthquake far away from the place) and it can take up to 22 hours to reach the coastal areas.

For example, in the earthquake ocurred in Japan in 2011, there were areas that were farther from the place where the tsunami was generated, so the inhabitants had between 15 and 20 minutes to evacuate, however, in other places the wave took only 10 minutes on landfall and the inhabitants had only 3 minutes to evacuate.

Answer:

Explanation:

Person A's velocity relative to the train is 0.  Therefore, the pitch of the horn will not change.

Answer:

D. The pitch does not change.

Explanation:

When the source of sound moves away, the pitch drops. and when the source of sound approaches the pitch rises. This is called'Doppler effect'.

Here the person a and the sound horn are both in the same vehicle. Which means their relative velocity is zero. So the horn is neither approaching nor receding the person A

If  the source is approaching

[tex]f_{new}= \frac{v_{sound} }{v_{sound} -v_{source} }f_{original}[/tex]

If the source is receding

[tex]f_{new}= \frac{v_{sound} }{v_{sound} +v_{source} }f_{original}[/tex]

Hence the right answer is option D. The pitch does not change

Answer:

0 J

Explanation:

Kinetic energy is defined as:

KE = 1/2 m v²

where m is mass and v is velocity.

The car starts at rest, so it has zero velocity.  Therefore, its initial kinetic energy is 0 J.

Answer:

[tex]6.4\cdot 10^{-15} N[/tex]

Explanation:

The electric force exerted on the electron is given by:

[tex]F=qE[/tex]

where

[tex]q=1.6\cdot 10^{-19}C[/tex] is the magnitude of the electron charge

E = 40000 V/m is the electric field

Substituting,

[tex]F=(1.6\cdot 10^{-19} C)(40000 V/m)=6.4\cdot 10^{-15} N[/tex]

By comparison, the gravitational force exerted on the electron is:

[tex]F=mg[/tex]

where

[tex]m=9.10939\cdot 10^{-31} kg[/tex] is the mass of the electron

g = 9.8 m/s^2 is the acceleration due to gravity

Substituting,

[tex]F=(9.10939\cdot 10^{-31} kg)(9.8 m/s^2)=8.93\cdot 10^{-30}N[/tex]

Final answer:

The force exerted on an electron by a 40000 V/m electric field is 6.408 × 10−15 N, which is significantly greater than the gravitational force on the electron (8.927 × 10−30 N). Therefore, gravitational forces on electrons are commonly neglected in physics.

Explanation:

The force exerted on an electron by an electric field can be calculated using the equation F = qE, where q is the charge of the electron and E is the electric field strength. Given the charge of the electron q = 1.602 × 10−19 C and the electric field strength E = 40000 V/m, we can calculate the force as:

F = (1.602 × 10−19 C) × (40000 V/m) = 6.408 × 10−15 N.

This force is much larger compared to the gravitational force on an electron, which is calculated by F = mg, where m is the mass of the electron and g is the acceleration due to gravity (9.8 m/s2). The mass of the electron m = 9.10939 × 10−31 kg, hence the gravitational force is:

F_gravity = (9.10939 × 10−31 kg) × (9.8 m/s2) ≈ 8.927 × 10−30 N.

The comparison between the electric force and gravitational force on an electron clearly shows that the electric force is significantly stronger, which is why gravitational forces on electrons are often neglected in physics calculations involving electric fields.

Answer:

Explanation: the answer is 1,425

(a) [tex]2.4\cdot 10^{-17} J[/tex]

The De Broglie wavelength of a particle is given by

[tex]\lambda=\frac{h}{p}[/tex] (1)

where

h is the Planck constant

p is the momentum of the particle

We also know that the kinetic energy of a particle (K) is related to the momentum by the formula

[tex]K=\frac{p^2}{2m}[/tex]

where m is the mass of the particle. Re-arranging this equation,

[tex]p=\sqrt{2mK}[/tex] (2)

And substituting (2) into (1),

[tex]\lambda = \frac{h}{\sqrt{2mK}}[/tex] (3)

For an electron,

[tex]m=9.11\cdot 10^{-31}kg[/tex]

In the problem, the electron has a de broglie wavelength equal to the diameter of a hydrogen atom in the ground state:

[tex]\lambda = d = 1\cdot 10^{-10} m[/tex]

So re-arranging eq.(3) we can find the kinetic energy of the electron:

[tex]K=\frac{h^2}{2m\lambda^2}=\frac{(6.63\cdot 10^{-34}Js)^2}{2(9.11\cdot 10^{-31} kg)(1\cdot 10^{-10} m)^2}=2.4\cdot 10^{-17} J[/tex]

(b) Approximately 10 times larger

The ground state energy of the hydrogen atom is

[tex]E_0 = 13.6 eV[/tex]

Converting into Joules,

[tex]E_0 =(13.6 eV)(1.6\cdot 10^{-19} J/eV)=2.2\cdot 10^{-18}J[/tex]

The kinetic energy of the electron in the previous part of the problem was

[tex]E=2.4\cdot 10^{-17} J[/tex]

So, we see it is approximately 10 times larger.

Final answer:

To determine the kinetic energy of an electron with a de Broglie wavelength equal to the diameter of a hydrogen atom, we use the de Broglie relation to first calculate the momentum and then find the kinetic energy. Subsequently, this energy can be compared to the ground-state energy of a hydrogen atom.

Explanation:

The student is asking about the properties of an electron with a de Broglie wavelength equal to the diameter of a hydrogen atom in its ground state. This problem can be solved using the de Broglie wavelength formula and the known size of the hydrogen atom. We relate the wavelength (λ) to the momentum (p) of the electron using the de Broglie relation λ = h/p, where h is Planck's constant. The diameter of a hydrogen atom in its ground state is approximately the size of the first Bohr orbit, which is about 0.053 nm or 5.3 x 10-11 m.

To find the kinetic energy (KE), we can first calculate the momentum using p = h/λ. Then, KE can be found using the expression KE = p2/2m, where m is the mass of the electron. We thus find the kinetic energy associated with an electron having a wavelength of 5.3 x 10-11 m.

Once the electron's kinetic energy is calculated, we can compare it to the ground-state energy of a hydrogen atom. The ground-state energy of a hydrogen atom is approximately -13.6 eV, where the negative sign indicates that the electron is bound to the nucleus. The kinetic energy of the electron, in this case, will be positive since it represents the energy associated with its motion.

Answer:

2 times

Explanation:

1st time on Feb. 20, 1962 at age 41

2nd time on Oct. 29, 1998 at age 77

Answer:

An estuary is the area where a river meets the sea or ocean, where fresh water from the river meets salt water from the sea.

Answer:

during the last interglacial period, the retreating of glaciers created massive valleys. When these glaciers melted the water filled up the valleys and thus created the first estuaries

Explanation:

Answer:

1 ms⁻¹ .

Explanation:

Speed is defined as the product of the wavelength times the frequency.

If v is the speed , λ is the given wavelength 0.2 m and frequency f is equal to 5 Hertz or wavelengths per second ,

v = λ f = 0.2 x 5 = 1 m/s

According to Einstein's theory of relativity, a black hole is a "singularity" that consists of a region of the space in which the density of matter tends to infinity. In consequence, this huge massive body has a gravitational pull so strong that not even light can escape from it.  

In addition, "the surface" of a black hole is called the event horizon, which is the border of space-time in which the events on one side of it can not affect an observer on the other side.  

In other words, at this border also called "point of no return", nothing can escape (not even light) and no event that occurs within it can be seen from outside.  

In this sense, and according to the relativity, it is possible to determine where a black hole is if it is "observed" an enormous amount of energy released. So, in accordance to this, galaxies like ours must have a black hole in its center.  

On the other hand, the elliptical galaxy Mesier 87 (also called Virgo A, but from now on M87) was showing the above described behaviour, with enormous jets of high-energy particles shooting away from its vicinity . This was imaged by the Hubble Space Telescope years ago; that is why astronemers were hypothesizing about the existence of a massive black hole there.  

Well now, on April, 10th 2019 this was demonstrated with the publication of the image, for the first time, of the event horizon of the black hole in M87. This is the first time in human history a picture of a black hole is taken.  

This was done by the huge effort of diverse scientist and by the syncronization of eight radio telescopes scattered across the Earth (located at: Hawaii, Spain, Chile, Mexico, Arizona and the South Pole), which took the same point of the sky at the same time.

Answer:

NUCLEAR BOMB

Explanation:

Answer:

1.D

2. False

3.True

4.True

5.C

6.B

7.C

8.B

9.A

10.True

11.D

12.B

13.A

If you have any questions more,you can ask me later

Answer:

These are all correct and verified

1.D

2. False

3.True

4.True

5.C

6.B

7.C

8.B

9.A

10.True

11.D

12.B

13.A

Explanation:

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(a) The child + the wagon

Explanation:

Newton's second law states that the net force applied on a system is equal to the mass of the system times its acceleration:

[tex]\sum F = ma[/tex] (1)

Here we are interested in calculating the acceleration of the child, a. However, the child moves together with the wagon - this means that we can consider the child+wagon as a single system, moving with an acceleration of a, under a net force of F,  which is the result of all the forces applied to the child+wagon.

(b) See attachment

There are 5 forces in total acting on the child+wagon system:

- The force exerted by the first child, 75.0 N, here to the left

- The force exerted by the second child, 90.0 N, here to the right

- The frictional force of 12.0 N, to the left (the direction of the frictional force is opposite to the direction of motion; since the larger force is the one exerted to the right, the system would move to the right, so the frictional force acts to the left)

- The weight of the child+wagon system, downward, which is equal to

W = mg

where m=23.0 kg is the total mass and g=9.8 m/s^2 is the acceleration due to gravity

- The normal reaction of the surface, upward, equal in magnitude to the weight

(c) 0.13 m/s^2

We are only interested in the forces acting along the horizontal direction, since the two forces in the vertical direction are in equilibrium.

The resultant force along the horizontal direction is

[tex]\sum F = 90.0 N - 75.0 N - 12.0 N =3.0 N[/tex]

By using Newton's second law (eq. 1), we can find the acceleration:

[tex]a=\frac{\sum F}{m}[/tex]

where

m = 23.0 kg is the mass of the child+wagon

Substituting,

[tex]a=\frac{3.0 N}{23.0 kg}=0.13 m/s^2[/tex]

(d) 0

In this case, the magnitude of the friction is 15.0 N. This means that the net force acting on the system is

[tex]\sum F = 90.0 N -75.0 N -15.0 N =0[/tex]

So, the forces along the horizontal direction are balanced as well. According to eq.(1), this also means that the acceleration along the horizontal axis will also be zero:

[tex]a=\frac{0}{23.0 kg}=0[/tex]

a) Child plus wagon

b) Refer the attached diagram.

c) [tex]\rm a = 0.13 \; m/sec^2[/tex]

d) a = 0

Given :

The first child exerts a force of 75 N, the second a force of 90 N.

Friction = 12N

Mass of the third child plus wagon is 23 kg.

Solution :

a) According to Newton's second law,

F = ma

Here we are interested in calculating the acceleration (a) of the child. However, the child moves together with the wagon - this means that we can consider the child plus wagon as a single system, moving with an acceleration of a, under a net force of F, which is the result of all the forces applied to the child plus wagon.

b) Refer the attached Diagram.

c) F = ma

 90 - 75 - 12 = 23a

 [tex]\rm a = \dfrac{3}{23}= 0.13\;m/sec^2[/tex]

d) F = ma

   90 - 75 - 15 = 23a

  a = 0

For more information, refer the link given below

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